updated Role, Plan logic and fixed tests

added exception for devise managed users.email to use our homegrown email validator

updated presence check to obey 'ifs' on validators. e.g. feedback_email_subject is required IF feedback_enabled?

created new find_know_invalidations rake task. Added new pre migrate step

added additional data cleanup steps to catch other orphaned records that might be found in other installations. Added stat rake tasks

added check for roles with orphaned user

organized the upgrade.rake and added a v2_0_0 task. add check for answers with missing plans to data cleanup

Added rake task to check record validity via SQL

Rename data cleanup rake task file